Package Exports

css-selector-extract

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Readme

css-selector-extract

With selector extracting, it is possible to extract certain CSS selectors (RegEx can be used to match selectors) from CSS code. This is especially useful if you want to extract only a few CSS classes from a huge library or framework.

Demos

var CssSelectorExtract = require('css-selector-extract');

// CSS source code as string.
var css = '.btn { } .btn-alert { } .btn-success { }';
// Array of selectors which should get extracted.
var selectorFilters = ['.btn'];

// Asynchronous:
CssSelectorExtract.process(css, selectorFilters).then((extractedCss) => {
  console.log(extractedCss); // Outputs: `.btn { }`.
});

// Synchronous:
var extractedCss = CssSelectorExtract.processSync(css, selectorFilters);
console.log(extractedCss); // Outputs: `.btn { }`.

Rename extracted selectors

var CssSelectorExtract = require('css-selector-extract');

// CSS source code as string.
var css = '.btn { } .btn-alert { } .btn-success { }';
// Array of selector filter objects with selectors
// which should get extracted and replaced.
var selectorFilters = [{ selector: '.btn', replacement: '.button' }];

// Asynchronous:
CssSelectorExtract.process(css, selectorFilters).then((extractedCss) => {
  console.log(extractedCss); // Outputs: `.button { }`.
});

RegEx

Filter selectors

var CssSelectorExtract = require('css-selector-extract');

var css = '.btn { } .btn-alert { }';
var selectorFilters = [/^\..+-alert/];

CssSelectorExtract.process(css, selectorFilters).then((extractedCss) => {
  console.log(extractedCss); // Outputs: `.btn-alert { }`.
});

Replace selectors

var CssSelectorExtract = require('css-selector-extract');

var css = '.btn { } .btn-alert { }';
var selectorFilters = [{ selector: /^\.btn(.*)/, replacement: '.button$1' }];

CssSelectorExtract.process(css, selectorFilters).then((extractedCss) => {
  console.log(extractedCss); // Outputs: `.button { } .button-alert { }`.
});

Usage with syntaxes other than pure CSS

Install the corresponding postcss syntax plugin (e.g. postcss-scss or postcss-less).

var CssSelectorExtract = require('css-selector-extract');
var postcssScss = require('postcss-scss');

var css = '.nested { .selector { } }';
var selectorFilters = ['.nested'];

// Add the postcss syntax plugin as third parameter.
CssSelectorExtract.process(css, selectorFilters, postcssScss).then((extractedCss) => {
  console.log(extractedCss);
});

Development

See CONTRIBUTING.md

Testing

npm test

About

Author

Markus Oberlehner
Website: https://markus.oberlehner.net
Twitter: https://twitter.com/MaOberlehner
PayPal.me: https://paypal.me/maoberlehner

License

MIT